Biglarian M.,Sharif University of Technology |
Rahimi Gorji M.,Islamic Azad University at Behshahr |
Pourmehran O.,Islamic Azad University at Gorgan |
Domairry G.,Islamic University of Technology
International Journal of Hydrogen Energy | Year: 2017
This paper investigates numerically the problem of unsteady magnetohydrodynamic nanofluid flow and heat transfer between parallel plates due to the normal motion of the porous upper plate. The governing equations are solved via the fourth-order Runge-Kutta method. Different kind of nanoparticles is examined. The effects of kind of nanoparticle, nanofluid volume fraction, expansion ratio, Hartmann number, Reynolds number on velocity and temperature profiles are considered. Also effect of different types of nanoparticles is examined. Results indicate that velocity decreases with increase of Hartmann number due to effect of Lorentz forces. Rate of heat transfer increase with increase of nanofluid volume fraction, Hartmann number and Reynolds number but it decreases with increase of expansion ratio. Also it can be found that choosing copper as a nanoparticle leads to highest enhancement. © 2017 Hydrogen Energy Publications LLC.
Zatirostami A.,Islamic Azad University at Behshahr
Australian Journal of Basic and Applied Sciences | Year: 2011
Photo Voltaic Pile devices based thin layer of cadmium sulfide, copper indium selenide D, and cadmium telluride to produce solar cells can be used on a large scale. Development of nanotechnology as well as opportunities for further development of these cells is the production of consumption expenditures. The porous alumina templates were created from a substrate is apparent that many opportunities for nanotechnology to improve performance and reduce costs of large-scale production of solar cells on thin layer provides, however, still challenges such as the quality of the scale Nano is not solved there. This paper investigates the alumina nano-pitted, pitted enamel Hello Nano-membranes, nano structured films pitted in alumina production of nano-cavity are addressed.
Reza Zardoost M.,Islamic Azad University at Qaemshahr |
Dehbandi B.,Islamic Azad University at Behshahr
Physica E: Low-Dimensional Systems and Nanostructures | Year: 2013
Electronic structure properties including bond lengths, bond angles, dipole moments (μ), energies, band gaps, NMR parameters of the isotropic and anisotropic chemical shielding parameters for the sites of various atoms were calculated using the density functional theory for Si, Ge, Sn, Pb doped (6,3) Chiral single-walled carbon nanotubes (SWCNTs). The calculations indicated that average bond lengths were as: Pb3C>Sn3C>Ge3C>Si3C>C3C. The dipole moments for Si, Ge, Sn, Pb doped (6,3) Chiral single-walled carbon nanotubes structures show fairly large changes with respect to the pristine model. © 2013 Elsevier B.V.
Rohani A.,Islamic Azad University at Shiraz |
Tirtashi M.R.S.,Islamic Azad University at Behshahr |
Noroozian R.,University of Zanjan
Journal of Power Electronics | Year: 2011
In this paper a robust method is presented for the combined design of STATCOM and Power System Stabilizer (PSS) controllers in order to enhance the damping of the low frequency oscillations in power systems. The combined design problems among PSS and STATCOM internal ac and dc voltage controllers has been taken into consideration. The equations that describe the proposed system have been linearized and a Fuzzy Logic Controller (FLC) has been designed for the PSS. Then, the Particle Swarm Optimization technique (PSO) which has a strong ability to find the most optimistic results is employed to search for the optimal STATCOM controller parameters. The proposed controllers are evaluated on a single machine infinite bus power system with the STATCOM installed in the midpoint of the transmission line. The results analysis reveals that the combined design has an excellent capability in damping a power system's low frequency oscillations, and that it greatly enhances the dynamic stability of power systems. Moreover, a system performance analysis under different operating conditions and some performance indices studies show the effectiveness of the combined design.
Ardakani M.R.K.,University of Yazd |
Amirkhanlou S.,Amirkabir University of Technology |
Amirkhanlou S.,Islamic Azad University at Behshahr |
Khorsand S.,Islamic Azad University at Najafabad
Materials Science and Engineering A | Year: 2014
Lightweight metal-matrix nanocomposites (MMNCs-metal matrix with nanosized ceramic particles) can be of significance for automobile, aerospace, and numerous other applications. There are some problems in obtaining suitable mechanical properties of MMNCs, including weak bonding between reinforcement and matrix, non-uniformity of reinforcement nanoparticles and high porosity content. In this study, aluminum/alumina nanocomposite was fabricated by stircasting method. Subsequently, cross accumulative roll bonding (CARB) process was used as an effective method for refinement of microstructure and improvement of mechanical properties. The microstructural evolution and the mechanical properties of the nanocomposites during various CARB cycles were examined by the Archimedes method, X-ray defractometer, scanning electron microscopy and tensile testing. The results showed that the microstructure of the nanocomposite after eight cycles of CARB had an excellent distribution of alumina nanoparticles in aluminum matrix without any remarkable porosity. The X-ray diffraction results showed that the crystallite size of the nanocomposite was 71. nm by employing eight cycles of CARB technique. Mechanical experiment also indicated that the ultimate tensile strength and the elongation of the nanocomposite increased as the number of CARB cycles increased. After eight CARB cycles, ultimate tensile strength and the elongation values reached 344. MPa and 6.4%, which were 3.13 and 3.05 times greater than those of as-cast nanocomposites, respectively. © 2013 Elsevier B.V.
Gholipour M.,Islamic Azad University at Behshahr |
Noubari H.A.,University of Tehran
ICSPS 2010 - Proceedings of the 2010 2nd International Conference on Signal Processing Systems | Year: 2010
In this paper, a VLSI implementation of the lifting-based Discrete Wavelet Transform (DWT) is presented. The behavioral description of integer-to-integer CDF (2,2) lifting wavelet, which is used in image compression has been coded in Verilog Hardware Description Language (HDL). The code has been synthesized and then implemented using both Field Programmable Gate Array (FPGA) and Application Specific Integrated Circuit (ASIC) design approaches. Post-synthesis and post-layout simulations verify the appropriate operation of he architecture. The resulting hardware can be used in image compression applications such as JPEG2000. © 2010 IEEE.
Rahmatian A.A.,Islamic Azad University at Behshahr |
Hosseini S.A.A.,Islamic Azad University at Behshahr
Iranian Journal of Psychiatry and Behavioral Sciences | Year: 2015
Background: The United Nations in a resolution defined abuse as any violent act that is primarily or exclusively committed against females and results in physical, sexual and psychological harm. Objectives: The aim of this research was to study the contributing factors of husband's violence against females residing in the city of Behshahr, Iran. Materials and Methods: We distributed a specifically designed questionnaire among 380 married females aged between 15 and 65 years. According to the Morgan table, the subjects were randomly selected from a list of 301000 females. Demographic data and data on spouse abuse were then analyzed using the SPSS software, Spearman and Pearson correlation coefficients. According to Cronbach's alpha, the reliability of the questionnaire was 0.96. Results: All of the females reported at least one form of violence within the past year, with R square 0.20, indicating that the independent variable can explain 20% of the violence against females. years of marriage, female's education, male's addiction and the number of children each had their share in the explanation of violence against females. Conclusions: This study revealed a high prevalence of domestic violence in the sample population. Violence existed among all ages, social categories and male occupational groups, and also involved both employed and unemployed females. The situation regarding domestic abuse is similar worldwide. © 2015, Mazandaran University of Medical Sciences.
Rostami M.M.,Islamic Azad University at Behshahr
Conference Proceedings - 2012 IEEE 7th International Power Electronics and Motion Control Conference - ECCE Asia, IPEMC 2012 | Year: 2012
Asynchronous generators has restrictions and problems such as frequency and reactive power control, and it has problem in output voltage control under dynamic Load fluctuations due to lack of separate field circuit. In this article, in order to control and voltage profile improvement Grid Connected Asynchronous Generator (GCASG), the use of parallel static compensators SVC (Static Var Compensator) & STATCOM (STATic synchronous COMpensator) is evaluated and compared. © 2012 IEEE.
Gholipour M.,Islamic Azad University at Behshahr
Communications in Computer and Information Science | Year: 2011
In this paper we present an FPGA implementation of 5/3 Discrete Wavelet Transform (DWT), which is used in image compression. The 5/3 lifting-based wavelet transform is modeled and simulated using MATLAB. DSP implementation methodologies are used to optimize the required hardware. The signal flow graph and dependence graph are derived and optimized to implement the hardware description of the circuit in Verilog. The circuit code then has been synthesized and realized using Field Programmable Gate Array (FPGA) of FLEX10KE family. Post-synthesis simulations confirm the circuit operation and efficiency. © 2011 Springer-Verlag Berlin Heidelberg.
Rostami M.M.,Islamic Azad University at Behshahr
2012 Proceedings of 17th Conference on Electrical Power Distribution, EPDC 2012 | Year: 2012
By the help of reactive power, different technological index could be improved in strength System. Voltage stability margin, considered as one the important index of strength system security determination. In this way, effects of Economic performance of ISO (Independent System Operator) must be investigated over reactive power dispatch. In reactive power optimal dispatch, usually voltage stability limit in crease per reactive power minimum cost describes as the main goal of this issue on the other hand, different purposes in reactive power. Short - term planning could be expressed as non - liner optimization issue. in this paper, one the newest methods of intelligent search called PSO Algorithm introduced for these models solution could be used that its capability evaluated by applying an Algorithm in optimal supplying of required reactive power for WSCC, 9-Bus System. Responses compared with genetic Algorithm method. © 2012 Iranian Association of Elect.